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<?php $str1= '082307'; echo substr(chunk_split($str1, 2, ':'),0,-2); ?> - See more at: http://www.w3resource.com/php-exercises/php-string-exercises.php#sthash.bzfnf2JW.dpuf
Output for git.master, git.master_jit, rfc.property-hooks
08:23:0 - See more at: http://www.w3resource.com/php-exercises/php-string-exercises.php#sthash.bzfnf2JW.dpuf

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